Hi
Growing at latitude 49°N (which corresponds to the northern half of France, Belgium, or southern Germany/Canada) imposes strict time constraints because of the autumn which arrives quickly and coolly.
​ The onset of flowering (Feminized Seeds / Photoperiodic)
​At this latitude 49°N, the days begin to shorten significantly from the summer solstice (June), but the critical signal of 12/12 light (or rather the photoperiod threshold specific to the plant) is generally reached in August.
​Start of flowering (The stretch), for most photoperiod varieties, flowering will begin between August 10 and 25.
​Appearance of the first visible pistils: You will start to see real little white pompoms towards the end of August / very beginning of September.
here is also what exists
FF (fast flowering) seeds.
they have a shorter time for flowering. I hope this will help you.
and autoflowering generally around 3 months it is finished. no need for 12/12 light time.
I hope this will help you. best wishes